amsmath: accidental leading space in \endpmatrix (minor glitch)

[nbeisert]

There is a leading space in the definition of \endpmatrix in amsmath:

latex2e/required/amsmath/amsmath.dtx

Line 2577 in 1f7272a

}{

This is certainly an accidentally missed % (alike definitions do not have it and it is the single occurrence of {\n in amsmath). Evidently, it has no effect in math mode. Nevertheless, it does not belong there.