Cleanup: Clang-Tidy else-after-return fixes

This addresses warnings from Clang-Tidy's `readability-else-after-return`
rule. This should be the final commit of the series of commits that
addresses this particular rule.

No functional changes.

source/blender/simulation/intern/hair_volume.cpp

@@ -710,9 +710,8 @@ BLI_INLINE float hair_volume_density_divergence(float density,
   if (density > density_threshold && density > target_density) {
     return strength * logf(target_density / density);
   }
-  else {
-    return 0.0f;
-  }
+
+  return 0.0f;
 }
 
 bool SIM_hair_volume_solve_divergence(HairGrid *grid,
@@ -1030,14 +1029,13 @@ bool SIM_hair_volume_solve_divergence(HairGrid *grid,
 
     return true;
   }
-  else {
-    /* Clear result in case of error */
-    for (i = 0, vert = grid->verts; i < num_cells; i++, vert++) {
-      zero_v3(vert->velocity_smooth);
-    }
 
-    return false;
+  /* Clear result in case of error */
+  for (i = 0, vert = grid->verts; i < num_cells; i++, vert++) {
+    zero_v3(vert->velocity_smooth);
   }
+
+  return false;
 }
 
 #if 0 /* XXX weighting is incorrect, disabled for now */

source/blender/simulation/intern/implicit_blender.c

@@ -1711,9 +1711,8 @@ BLI_INLINE float fbstar(float length, float L, float kb, float cb)
   if (tempfb_fl < fbstar_fl) {
     return fbstar_fl;
   }
-  else {
-    return tempfb_fl;
-  }
+
+  return tempfb_fl;
 }
 
 // function to calculae bending spring force (taken from Choi & Co)
@@ -1725,9 +1724,8 @@ BLI_INLINE float fbstar_jacobi(float length, float L, float kb, float cb)
   if (tempfb_fl < fbstar_fl) {
     return -cb;
   }
-  else {
-    return -kb * fbderiv(length, L);
-  }
+
+  return -kb * fbderiv(length, L);
 }
 
 /* calculate elonglation */
@@ -1864,9 +1862,8 @@ bool SIM_mass_spring_force_spring_bending(
 
     return true;
   }
-  else {
-    return false;
-  }
+
+  return false;
 }
 
 BLI_INLINE void poly_avg(lfVector *data, const int *inds, int len, float r_avg[3])
@@ -2352,9 +2349,8 @@ bool SIM_mass_spring_force_spring_goal(Implicit_Data *data,
 
     return true;
   }
-  else {
-    return false;
-  }
+
+  return false;
 }
 
 #endif /* IMPLICIT_SOLVER_BLENDER */

source/blender/simulation/intern/particle_function.cc

@@ -102,9 +102,8 @@ fn::GVSpan ParticleFunctionEvaluator::get(int output_index, StringRef expected_n
   if (particle_fn_.output_is_global_[output_index]) {
     return fn::GVSpan::FromSingleWithMaxSize(type, buffer);
   }
-  else {
-    return fn::GVSpan(fn::GSpan(type, buffer, mask_.min_array_size()));
-  }
+
+  return fn::GVSpan(fn::GSpan(type, buffer, mask_.min_array_size()));
 }
 
 void ParticleFunctionEvaluator::compute_globals()